This is a 3 layer foam bath sponge made of 2 types of urethane home with different sizes of non-woven fabric and bubbles. The fine bubbles foam is easy to clean, and the coarse bubbles drain well and keep clean. The white color has been tailored to make it easy to see how it is worn out. Please use the characteristics of polyurethane that gradually changes color and replace it when it gets dark. The design blends into the background of a comb and is not too noticeable.